Piston for internal combustion or explosion engines.



No. 874.006. PATENTED DEG.17, 1907 J. HARTOOH. PISTON FOR INTERNAL COMBUSTION OR EXPLOSION ENGINES.

APPLIOATION FILED MAY II 1907.

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. difficulties in such small engines.

.JL'UL'S HARTOGH, OF WIESBADEN, GERMANY PISTON FOR INTERNAL COMBUSTION OR EXPLOSION ENGINE S.

To (171 whom it may concern:

.Be it known that I, JULIUS HARTOCH, a subject of the Emperor of Russia, residin at Wieshaden, in the Kingdom of Prussia,: er-

man Empire, have inventedcertain new and useful improvements in Pistons for Internal Comliustion or Explosion Motors, for which the following is a full, clear, and exact de' scription.

The present invention has for its object adevice for cooling the piston bottom of internal combustion orexplosion motors.

As is known, the pistons of lar e gas engines are generally water cooled, ut in the case of small motors with cylinders of small diameter cooling of the piston is not usually resorted to, as water cooling leads to many Now'in order to render it possible to make use of the advantages of the piston cool in the case of small motors, which are usual y constructed with open cylinders in such a manner, that the trunk piston carries the cross head gudgeon in accordance withthe present in- Fig. '5 shows the U-slha vention, thin cooling ribs are provided in the cavity of the piston. On the cylinder mouth a forcing plate is arranged, which ran-- ters into the iston cavity during the forward stroke o the piston, so that the movement of the piston and its rod is not impeded.

Owing to this arrangement, the warmv witlnnthe piston cavityis forced out when the piston makes its forward stroke and fresh air is suckedin when the piston makes 1ts inward stroke. The coohnglinner surface 1 of the piston is enlarged by the arrangement. of he inner ribs and so the entering fresh air may cool very efficiently the iston bottom.

Reference is to be had to t e accompanyin drawings, in which: I Figure 1 is a longitudinal section of the former end of the cylinder .ofan explosion motor with the pistoriin its bore, Figs. 2 and 3 are plan views of the c linder mouth and Fig. 4 shows a modified orm of the piston. d stay-rods, by which the forcing plate is astened to the motor frame. in Fig.1 1) is the cylinder of an explosion motor. The cylinder is rigidly connected wi h the frame 0 ofthe motor, so that an annular space d remains between the outer surface'of the cylmder and the'inner surface ofthe frame. Packing rings e of suitable metal are provided for tightening the cylinder Specification of Letters Patent.

Application filed May 11 v1907. Serial No. 373.079.

Patented Dec. 1.7, 1907.

within the frame. The hollow piston f bears the piston rod g, which is connected to the piston b means of a cone 7?. and screw and nut if 11 its interior the with thin cooling ribs 7:, w ch extend from the piston Z to the forward end ofthe piston.

Lipton is provided On the cylinder mouth a forcing plate m is arranged, which is formed as an annular plate, so that the movement of the piston and of its rod is not' impeded. Ifthe piston rod is rigidly connected to the piston, as

shown iii-Fig, 1,, the forcing late m has the form of an annular, plate as s own in Fig. 2.

'If the piston rodis' pivoted to a crosshead .gudgeon, arranged in the hollow of the piston,

there are two forcing plates 11, n, between which a space 0 remains, in which the connecting rod can entelz, The forcing plate is fastened to the frame of the'machine by U- shaped stayrods p as shown in Fig. 5 so that the piston can move outward from the cylin-.

der.

The coolin ribs ma be formed as a separate art as s own in i a ho ow c linder q of t 'n metal is inserted and the cy inder g is provided with the cooling ribs 1'. This is a very advantageous ar rangement, as it permits of using any suitable metal, so that very thin ribs may be obtained by casting.

What I-claim as my invention secure by Letters Patent is:

1. In internal combustion or explosion motors the combination of a hollow plunger piston being open atone end and having internal cooling ribs with a means for forcing out the air'in the piston cavity.

2. In internal combustion or explosion motors the combination of'a hollow piston being open at one end and having in its intefor forcing out the air in the piston cavity.

3Tln internal combustion or explosion motors the combination of a hollow piston. being open at one end and having in it's interior .eoo ing ribs with a forcing plate arran ed at the open end of the cylinder and of sue a form-that the movement-ofthe piston and its rod is not impeded.

f JULIUS HARTQCH. Witnesses:

Mom'rz Wnrznn, Hnrmucn Gears.

4. In the piston-f and desire to 

